You can start by visiting https://2020census.gov/
You can also call 1-844-330-2020. The Census Bureau is offering a callback option to better respond to requests during periods of high call volume. When the callback option is presented, simply provide your preferred phone number and time of day for a return call, and an official census representative will call you back to collect your response to the 2020 Census.
Do not visit any site that does not have a .GOV at the end for Census information.
Most important? Your safety.
There are lots of scams out there where people are pretending to be census workers. The number one way you can avoid a census scam is to adhere to the deadline on the census letter you receive in the mail. Finish the survey and you will remove yourself from the list of non-participants. If you are every in doubt about the legitimacy of a census worker, visit this website: https://www.census.gov/about/regions/denver/contact/identify.html
Call the Denver Regional Office for verification at 1-800-852-6159. Office hours are Monday through Friday, 7:00 a.m.- 4:30 p.m., Mountain Daylight Time.
The City of Delafield will post more reminders about census workers as the time approaches.